Dual chamber cardiac pacemaker employing hysteresis to maximize the number of normally conducted ventricular beats with an optimum A-V delay for paced ventricular beats

(19)

(11)

EP 0 574 127 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	24.07.1996 Bulletin 1996/30

(43)	Date of publication A2:
	15.12.1993 Bulletin 1993/50

(21)	Application number: 93303349.0

(22)	Date of filing: 28.04.1993

(51)	International Patent Classification (IPC)⁵: A61N 1/36

(84)	Designated Contracting States:
	BE CH DE ES FR GB IT LI NL SE

(30)

Priority:

08.06.1992 US 894872

(71)	Applicant: CARDIAC PACEMAKERS, INC.
	St. Paul, Minnesota 55112-5798 (US)

(72)	Inventors:
	Hauser, Robert G. Long Lake, Minnesota 55356 (US) Spinelli, Julio C. Shoreview, Minnesota 55126 (US)

(74)	Representative: MacGregor, Gordon et al
	ERIC POTTER CLARKSON St. Mary's Court St. Mary's Gate Nottingham, NG1 1LE Nottingham, NG1 1LE (GB)

(54)	Dual chamber cardiac pacemaker employing hysteresis to maximize the number of normally conducted ventricular beats with an optimum A-V delay for paced ventricular beats

(57) A DDD pacemaker including stimulating means (48) to stimulate the ventricles of a heart after a predetermined A-V delay period includes means (44) for adjusting the A-V delay period to enhance the probability of detecting naturally occurring ventricular depolarization signals when such signals are being detected at a predetermined rate and switching to a more hemodynamically appropriate A-V delay period when paced beats predominate. The invention is implemented in software run on a microprogrammable controller comprising the DDD pacemaker.

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